I have overheard this conversation between Eric and Alex several times, plus heard about it when I got home:
Alex: “Daddy, can you come downstairs and play trains with me?”
Eric: “I can’t right now, Alex, I’m entertaining Beth.”
Alex then proceeds to bring Beth a huge pile of toys, and even sometimes plays with her for a couple of minutes. Then:
Alex: “Daddy, I brought Beth toys so she can play. Can you come downstairs and play trains now?”
It never actually works because I’m usually doing something so Eric needs to keep Beth out of my way, but Alex has done this four or five times now.